Organization and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Feb. 28, 2018	Jan. 31, 2015	Mar. 31, 2018
Allowance for Doubtful Accounts
Allowance for doubtful accounts			$ 0
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the beginning			2,291
Provision related to current period sales			1,735
Adjustment related to prior period sales			(447)
Credit or payments made during the period			(1,802)
Balance at the end			1,777
Profit Loss Percentage as per Collaboration Agreement	33.00%	35.00%
Chargebacks, Discounts and Fees
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the beginning			992
Provision related to current period sales			1,482
Adjustment related to prior period sales			(71)
Credit or payments made during the period			(1,515)
Balance at the end			888
Government and Other Rebates
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the beginning			352
Provision related to current period sales			174
Adjustment related to prior period sales			73
Credit or payments made during the period			(238)
Balance at the end			361
Returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the beginning			947
Provision related to current period sales			79
Adjustment related to prior period sales			(449)
Credit or payments made during the period			(49)
Balance at the end			$ 528
Mylan
Movement in Valuation Allowances and Reserves [Roll Forward]
Profit Loss Percentage as per Collaboration Agreement		65.00%